What began as an impromptu way to wake up her daughter Stormi Webster became one of the biggest social media sensations of 2019.
All it took was a photo on Instagram of the triple threat's hand sporting an emerald-cut diamond ring and three words, "she said yes," to confirm her engagement to Alex Rodriguez—and simultaneously set the Internet ablaze.
When social media queen Kim Kardashian welcomed her fourth child, Psalm West, she announced his arrival and his unique name by way of Twitter.
Perhaps the stars' secret Las Vegas wedding would have stayed under wraps a bit longer had Diplo not live-streamed some of the ceremony on Instagram.
Meghan Markle and Prince Harry welcomed their first child on their own terms, down to announcing their son's arrival on none other than their official Instagram account.
Arguably the biggest couple of 2019 had the last laugh about their kissing skills when they posted this clip of a super sloppy makeout sesh on Instagram, which has since been viewed more than 34 million times.
Taylor Swift's drama with Scooter Braun and Scott Borchetta famously reached new public heights when the superstar songstress unveiled her side of the story on her Tumblr page, swiftly sparking a social media explosion.
When Jennifer Aniston joined Instagram, her fans were there for her—15 million times.
Nearly two months after suffering a car crash, the blockbuster star returned to social media with gripping footage of his behind-the-scenes recovery, which has since been viewed more than 11 million times.
Leave it to Ryan Reynolds to "share the first photo of his newborn daughter" this way, collecting more than 85,000 likes on the tweet in the process.
A revealing snap of the performer in solely his boxers—and Instagram's subsequent removal of it—spawned enough headlines for every remaining day of 2019.